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I've found that Lugol's Iodine does kill the adults in higher concentrations. I was using about 12 to 15 drops in as little as 1 sixteen ounce cup of water. Almost triple the dose you attempted. It took about 25 to 35 seconds. Unsure of what it does to the eggs.
Try shaking the coral inside the cup violently while it is submerged, after dipping it in the super high concentration. You'll be amazed at what drops off. It's almost creepy.
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